206166478 has 16 divisors (see below), whose sum is σ = 353624544. Its totient is φ = 88308000.

The previous prime is 206166451. The next prime is 206166517. The reversal of 206166478 is 874661602.

It is a self number, because there is not a number n which added to its sum of digits gives 206166478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34728 + ... + 40228.

It is an arithmetic number, because the mean of its divisors is an integer number (22101534).

Almost surely, 2^206166478 is an apocalyptic number.

206166478 is a deficient number, since it is larger than the sum of its proper divisors (147458066).

206166478 is a wasteful number, since it uses less digits than its factorization.

206166478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8187.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 206166478 is about 14358.4984591008. The cubic root of 206166478 is about 590.7531108603.

The spelling of 206166478 in words is "two hundred six million, one hundred sixty-six thousand, four hundred seventy-eight".